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Direct conversion of CO_(2)to graphene via vapor–liquid reaction for magnesium matrix composites with structural and functional properties

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Journal of Magnesium and Alloys 2023年第4期11卷 1206-1212页

作者： Xuejian Li Xiaojun Wang Xiaoshi Hu Chao Xu Wenzhu Shao Kun Wu State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin 150001PR China National Key Laboratory of Precision Hot Processing of Metal Harbin Institute of TechnologyHarbin 150001PR China

Converting CO_(2)to valuable materials is attractive in environmental protection and resource *** this study,a vapor-liquid interface reaction system for mass production of high-quality graphene is *** graphene obtained has high crystallinity and few defects during the reaction of CO_(2)and Mg *** growth mechanism of graphene is demonstrated in vapor-liquid interface area by combining the CO_(2)bubbles as a soft template to guide growth with the confinement effect of dense MgO *** quality of the graphene is verified by epoxy composites with high electromagnetic shielding ***,the V-L reaction method ingeniously solves the dispersion of graphene in metal,providing a preparation strategy of Mg matrix composites with structure and function integration.

关键词： Graphene Vapor-liquid interface Magnesiothermic reaction Dispersion Shielding effectiveness

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Large-area flexible and transparent UV photodetector based on cross-linked Ag NW@ZnO NRs with high performance

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Journal of Materials Science & technology 2022年第15期110卷 65-72页

作者： Lin Zhang Nuomei Li Qiuchen Ma Jiahui Ding Chuang Chen Zhaocheng Hu Weiwei Zhao Yufeng Li Huanhuan Feng Mingyu Li Hongjun Ji Sauvage Laboratory for Smart Materials ShenzhenKey Laboratory of Flexible Printed Electronics TechnologySchool of Materials Science and EngineeringHarbin Institute of TechnologyShenzhen 518055China State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyShenzhen 518055China

A series of large-area,flexible and transparent ultraviolet(UV)photodetectors(PDs)based on Ag nanowire(NW)@ZnO nanorods(NRs)are fabricated by an inexpensive,facile and effective *** Ag NW@ZnO NRs are successfully synthesized using a two-step method in an oil bath with a high surface-to-volume ratio and good *** PDs are fabricated by drop-coating with different drop-coating times on the surface of polyethylene terephthalate(PET)coupled with Au *** optimizing the cross-linked network of Ag NW@ZnO NRs,PD2 with a size greater than 25 mm exhibits excellent photoresponse under UV light illumination of 365 nm(1.3 m W cm^(-2))with a bias of 5 V:a high sensitivity of over 10^(3),and a much shorter rise/decay time of 2.6 s/2.3 ***,the detector exhibits an average transmittance of more than 70%in the visible light region,as well as good flexibility and excellent mechanical stability under a bending angle of 120°over 1000 circles *** integral advantages have significant potential for practical applications and mass production.

关键词： Ag NW@ZnO NRs Low dark current Rapid response Transparent Flexible Large-area

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Green recycling of short-circuited garnet-type electrolyte for high-performance solid-state lithium batteries

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Journal of Energy Chemistry 2023年第5期80卷 492-500,I0012页

作者： Yongxian Huang Zhiwei Qin Cheng Shan Yuming Xie Xiangchen Meng Delai Qian Gang He Dongxin Mao Long Wan State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin 150001HeilongjiangChina Zhengzhou Research Institute Harbin Institute of TechnologyZhengzhou 450046HenanChina School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001HeilongjiangChina

Solid-state lithium batteries(SSLBs)solve safety issues and are potentially energy-dense alternatives to next-generation energy storage *** green recycling routes are responsible for the widespread use of SSLBs due to minimizing environmental contamination,reducing production costs,and providing a sustainable solution for resources,e.g.,saving rare earth elements(La,Ta,etc.).Herein,a solid-state recycling strategy is proposed to achieve green recycling of the crucial component solidstate electrolytes(SSEs)in spent *** short-circuited garnet Li_(6.5)La_(3)Zr_(1.5)Ta_(0.5)O_(12)(LLZTO)is broken into fine particles and mixed with fresh particles to improve sintering activity and achieve high packing *** continuous Li absorption process promotes sufficient grain fusion and guarantees the transformation from tetragonal phase to pure cubic phase for high-performance recycled *** Li-ion conductivity reaches 5.80×10^(-4)S cm-1with a relative density of 95.9%.Symmetric Li cell with asrecycled LLZTO shows long-term cycling stability for 700 h at 0.3 mA cm^(-2)without any voltage *** cell exhibits an excellent cycling performance with a discharge capacity of 141.5 mA h g^(-1)and a capacity retention of 92.1%after 400 cycles(0.2C).This work develops an environmentally friendly and economically controllable strategy to recycle SSE from spent SSLBs,guiding future directions of SSLBs large-scale industrial application and green recycling study.

关键词： Solid-state electrolytes Li-garnet Green recycling Solid-state lithium batteries Cycling stability

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Regulation of interlayer channels of graphene oxide nanosheets in ultra-thin Pebax mixed-matrix membranes for CO_(2) capture

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Chinese Journal of Chemical Engineering 2024年第3期67卷 257-267页

作者： Feifan Yang Yuanhang Jin Jiangying Liu Haipeng Zhu Rong Xu Fenjuan Xiangli Gongping Liu Wanqin Jin State Key Laboratory of Materials-Oriented Chemical Engineering College of Chemical EngineeringNanjing Tech UniversityNanjing 211816China Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology School of Petrochemical EngineeringChangzhou UniversityChangzhou 213164China Shandong Production and Research Long Membrane Technology Development Co. Ltd.Yantai Economic Development ZoneYantai 265505China

For the application of carbon capture by membrane process,it is crucial to develop a highly permeable CO_(2)-selective *** this work,we reported an ultra-thin polyether-block-amide(Pebax)mixedmatrix membranes(MMMs)incorporated by graphene oxide(GO),in which the interlayer channels were regulated to optimize the CO_(2)/N_(2) separation *** membrane preparation conditions were systematically investigated on the influence of the membrane structure and separation performance,including the lateral size of GO nanosheets,GO loading,thermal reduction temperature,and *** results demonstrated that the precisely regulated interlayer channel of GO nanosheets can rapidly provide CO_(2)-selective transport channels due to the synergetic effects of size sieving and preferential *** GO/Pebax ultra-thin MMMs exhibited CO_(2)/N_(2) selectivity of 72 and CO_(2) permeance of 400 GPU(1 GPU=106 cm^(3)(STP)·cm^(2)·s^(-1)·cmHg^(-1)),providing a promising candidate for CO_(2) capture.

关键词： Mixed-matrix membrane Ultra-thin membrane Pebax Graphene oxide CO_(2) capture

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Hybrid model for BOF oxygen blowing time prediction based on oxygen balance mechanism and deep neural network

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International Journal of Minerals,Metallurgy and Materials 2024年第1期31卷 106-117页

作者： Xin Shao Qing Liu Zicheng Xin Jiangshan Zhang Tao Zhou Shaoshuai Li State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China Engineering Research Center of MES Technology for Iron&Steel Production Ministry of EducationBeijing 100083China Laiwu Iron and Steel Group Yinshan Section Steel Co. Ltd.Jinan 271104China

The amount of oxygen blown into the converter is one of the key parameters for the control of the converter blowing process,which directly affects the tap-to-tap time of converter. In this study, a hybrid model based on oxygen balance mechanism (OBM) and deep neural network (DNN) was established for predicting oxygen blowing time in converter. A three-step method was utilized in the hybrid model. First, the oxygen consumption volume was predicted by the OBM model and DNN model, respectively. Second, a more accurate oxygen consumption volume was obtained by integrating the OBM model and DNN model. Finally, the converter oxygen blowing time was calculated according to the oxygen consumption volume and the oxygen supply intensity of each heat. The proposed hybrid model was verified using the actual data collected from an integrated steel plant in China, and compared with multiple linear regression model, OBM model, and neural network model including extreme learning machine, back propagation neural network, and DNN. The test results indicate that the hybrid model with a network structure of 3 hidden layer layers, 32-16-8 neurons per hidden layer, and 0.1 learning rate has the best prediction accuracy and stronger generalization ability compared with other models. The predicted hit ratio of oxygen consumption volume within the error±300 m^(3)is 96.67%;determination coefficient (R^(2)) and root mean square error (RMSE) are0.6984 and 150.03 m^(3), respectively. The oxygen blow time prediction hit ratio within the error±0.6 min is 89.50%;R2and RMSE are0.9486 and 0.3592 min, respectively. As a result, the proposed model can effectively predict the oxygen consumption volume and oxygen blowing time in the converter.

关键词： basic oxygen furnace oxygen consumption oxygen blowing time oxygen balance mechanism deep neural network hybrid model

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UHGEval: Benchmarking the Hallucination of Chinese Large Language Models via Unconstrained Generation 62

UHGEval: Benchmarking the Hallucination of Chinese Large Lan...

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62nd Annual Meeting of the Association for Computational Linguistics, ACL 2024

作者： Liang, Xun Song, Shichao Niu, Simin Li, Zhiyu Xiong, Feiyu Tang, Bo Wang, Yezhaohui He, Dawei Cheng, Peng Wang, Zhonghao Deng, Haiying School of Information Renmin University of China Beijing China Institute for Advanced Algorithms Research Shanghai China State Key Laboratory of Media Convergence Production Technology and Systems Beijing China

ISBN: (纸本)9798891760943

Large language models (LLMs) produce hallucinated text, compromising their practical utility in professional contexts. To assess the reliability of LLMs, numerous initiatives have developed benchmark evaluations for hallucination phenomena. However, they often employ constrained generation techniques to produce the evaluation dataset due to cost and time limitations. For instance, this may involve employing directed hallucination induction or deliberately modifying authentic text to generate hallucinations. These are not congruent with the unrestricted text generation demanded by real-world applications. Furthermore, a well-established Chinese-language dataset dedicated to the evaluation of hallucinations is presently lacking. Consequently, we have developed an Unconstrained Hallucination Generation Evaluation (UHGEval) benchmark, containing hallucinations generated by LLMs with minimal restrictions. Concurrently, we have established a comprehensive benchmark evaluation framework to aid subsequent researchers in undertaking scalable and reproducible experiments. We have also evaluated prominent Chinese LLMs and the GPT series models to derive insights regarding hallucination. © 2024 Association for Computational Linguistics.

关键词： Computational linguistics

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A Novel Low- Temperature Cu/SiO2 Hybrid Bonding Based on Functional Group Selective Construction

A Novel Low- Temperature Cu/SiO2 Hybrid Bonding Based on Fun...

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International Conference on (ICEPT) Electronic Packaging technology

作者： Fanfan Niu Qiushi Kang Xiaohui Yuan Chenxi Wang State Key Laboratory of Advanced Welding and Joining Harbin Institute of Technology Harbin China

ISBN: (数字)9798350353808

ISBN: (纸本)9798350353815

Hybrid bonding technology is a high-density 3D integration technology that can significantly reduce the interconnect distance, allowing multifunctional chips to be processed independently. Therefore, it can enhance the flexibility of chip processing and mitigate production costs. However, in order to take into account the different degrees of high temperature tolerance of various heterogeneous chips and avoid the problems of wafer warping and device failure caused by inconsistent thermal expansion coefficients, it is urgent to develop a low temperature hybrid bonding process. At present, Cu and SiO 2 remain the prevailing choices for interconnect materials in hybrid bonding technology. The key to achieving Cu/SiO 2 low temperature hybrid bonding is to simultaneously obtain an oxide-free Cu surface and a hydroxy-enriched SiO 2 surface using the same surface activation process. Therefore, a novel approach for synergistic activation bonding has been devised and implemented, which involves the utilization of Ar/H2 plasma activation and citric acid immersion. By this way, strong Cu/Cu and SiO 2 /SiO 2 bonding pairs can be simultaneously achieved at 200°C. The evaluations through tensile testing and scanning electron microscopy reveal that both Cu/Cu and SiO 2 /SiO 2 exhibit sufficient strength to endure mechanical polishing without any interface defects. In summary, our method presents a promising solution for the low-temperature hybrid bonding of Cu/SiO 2 , which promotes the future development of multifunctional chips 3D integration.

关键词： Silicon compounds Thermal expansion Scanning electron microscopy production Plasmas Bonding Plasma temperature

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Scaling,optimisation,and application of vegetation canopy radiative transfer model at microclimate scale

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Building Simulation 2024年第10期17卷 1805-1821页

作者： Junru Yan Lihua Zhao Xiufeng Sun Huihui Zhao Haichao Zheng Yu Wang Key Laboratory of Agricultural Biosafety and Green Production of Upper Yangtze River(Ministry of Education) College of Horticulture and Landscape ArchitectureSouthwest UniversityChongqing 400715China State Key Laboratory of Subtropical Building and Urban Science School of ArchitectureSouth China University of TechnologyGuangzhou 510640China School of Architecture and Urban Planning Shandong Jianzhu UniversityJinan 250100China School of Advanced Agriculture and Bioengineering Yangtze Normal UniversityChongqing 408100China

Urban greenery is widely recognised as a strategy to mitigate urban overheating,and its shading capacity is crucial for improving microclimate and thermal ***,research on modelling the vegetation canopy radiation transfer(VCRT)process for the microscale is lacking,and most existing VCRT models are taken out from mesoscale *** this study,we used canopy morphology and structure as an entry point to construct a VCRT model for the microscale,from the mesoscale ***,100 m and 1000 m were defined as the critical scales by scaling,and the effect of leaf distribution on VCRT was *** VCRT model was made applicable to the microscale by introducing a scattered radiation source term and 6 leaf inclination distribution(LID)functions,and the results showed that the proposed model could improve the accuracy of canopy radiation absorptivity by about 11%.In addition,both leaf area index(LAI)and LID had significant effects on VCRT,and vegetation with LAI above 2 and spreading leaves had better shading *** is worth noting that urban greenery has an exciting potential for thermal comfort improvement,with the potential to regulate even extremely hot weather from near"very hot"(148 W/m^(2))to almost"comfortable"(69 W/m^(2)).This study is a catalyst for improving the predictability of the VCRT process for microclimate and thermal comfort,providing theoretical support and implications for mitigating urban overheating and enhancing urban thermal resilience.

关键词： vegetation canopy radiative transfer scaling microclimate thermal comfort

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Carbothermic reduction of vanadium titanomagnetite with the assistance of sodium carbonate

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International Journal of Minerals,Metallurgy and Materials 2022年第2期29卷 239-247页

作者： Luming Chen Yulan Zhen Guohua Zhang Desheng Chen Lina Wang Hongxin Zhao Fancheng Meng Tao Qi National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology Institute of Process EngineeringBeijing 100190China School of Chemical Engineering University of Chinese Academy of SciencesBeijing 100190China State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China

The carbothermic reduction of vanadium titanomagnetite concentrate(VTC)with the assistance of Na_(2)CO_(3)was conducted in an argon atmosphere between 1073 and 1473 K.X-ray diffraction and scanning electron microscopy were used to investigate the phase transformations during the *** investigating the reaction between VTC and Na_(2)CO_(3),it was concluded that molten Na_(2)CO_(3)broke the structure of titanomagnetite by combining with the acidic oxides(Fe_(2)O_(3),TiO_(2),Al_(2)O_(3),and SiO_(2))to form a Na-rich melt and release FeO and ***,Na_(2)CO_(3)accelerated the reduction *** addition,adding Na_(2)CO_(3)also benefited the agglomeration of iron particles and the slag–metal separation by decreasing the viscosity of the ***,Na_(2)CO_(3)assisted carbothermic reduction is a promising method for treating VTC at low temperatures.

关键词： vanadium titanomagnetite sodium carbonate phase transformation carbothermic reduction slag–metal separation

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Quantitative study of dimensional stability mechanism and microstructure evolution during precipitation process of 2024Al alloy

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Journal of Materials Science & technology 2021年第31期90卷 85-94页

作者： Youfang Cao Longtao Jiang Deng Gong Guoqin Chen Ziyang Xiu Yangming Cheng Xiufang Wang Gaohui Wua School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China State Key Laboratory of Advanced Welding Production Technology Harbin Institute of TechnologyHarbin 150001China Shanghai Institute of Microsystem and Information Technology Chinese Academy of SciencesShanghai 200050China

In this paper,we were devoted to quantitatively analyzing the dimensional change of 2024 Al alloy during the aging *** of precipitates have been defined and the corresponding volume fraction has been measured with Transmission Electron Microscopy(TEM)and Three-Dimensional Atom Probe Tomography(3 D-APT).Guinier-Preston-Bagaryatsky(GPB)zone(0.86 vol.%)was found after aging for 8 *** zone(0.17 vol.%)and S'phase(1.02 vol.%)was found after aging for 24 *** reduced dimensional change was attributed to the reduction of matrix lattice *** to the initial supersaturated solid solution state,the lattice strain of-2.79×10^(-5)and-5.16×10^(-5)was produced after 8 h and 24 h aging *** difference of the lattice parameters between the precipitates and matrix was also considered.A model was established to quantitatively describe the relationship between the precipitation process and dimensional change of 2024 Al alloy.

关键词： Aluminum alloy Aging Atom probe tomography(APT) Dimensional stability Precipitate

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